✨ add jest eslint conf

Author: dudeofawesome

eslint-config-jest/base.yaml

@@ -1,4 +1,27 @@
-plugins:
-  - 'jest'
-env:
-  jest/globals: yes
+# extends:
+#   - 'plugin:jest/recommended'
+
+overrides:
+  - files:
+      - 'test/**'
+      - '__test__/**'
+      - '*.test.*'
+      - '*.spec.*'
+      - '*.unit.*'
+      - '*.e2e.*'
+    extends:
+      - 'plugin:jest/recommended'
+    settings:
+      jest:
+        version: 'detect'
+
+    rules:
+      # prevent return statements in tests
+      jest/no-test-return-statement: 'error'
+
+      # use jest comparators instead of comparing booleans
+      jest/prefer-comparison-matcher: 'error'
+      jest/prefer-equality-matcher: 'error'
+
+      # require hooks to be inside a describe
+      jest/require-top-level-describe: 'error'

eslint-config-jest/package.json

@@ -18,10 +18,10 @@
   "license": "MIT",
   "main": "base.yaml",
   "scripts": {
-    "test": "echo 'No tests'; exit 0"
+    "test": "node --require ts-node/register --test test/index.ts"
   },
   "dependencies": {
-    "@shopify/eslint-plugin": "^43.0.0"
+    "eslint-plugin-jest": "^27.4.0"
   },
   "peerDependencies": {
     "@dudeofawesome/eslint-config": "^1.3.0",

eslint-config-jest/test/.eslintrc.yaml

@@ -0,0 +1,6 @@
+root: true
+extends:
+  - '@dudeofawesome'
+  - '@dudeofawesome/jest'
+parserOptions:
+  ecmaVersion: 2022

eslint-config-jest/test/index.ts

@@ -0,0 +1,31 @@
+import { describe, it } from 'node:test';
+import { ESLint } from 'eslint';
+import {
+  testRuleFail,
+  testNoFail,
+  defaultTestSet,
+} from '../../utils/testing/eslint';
+
+const linter = new ESLint({ cwd: __dirname });
+
+describe('eslint-config-node', () => {
+  defaultTestSet(linter);
+
+  describe('passes', () => {
+    it(`should have jest globals in test file`, () =>
+      testNoFail({
+        linter,
+        code: `describe('test', () => {});\n`,
+        file_path: 'test/thing.js',
+      }));
+  });
+
+  describe('fails', () => {
+    it(`should not have jest globals in non-test file`, () =>
+      testRuleFail({
+        linter,
+        code: `describe('test', () => {});\n`,
+        ruleId: 'no-undef',
+      }));
+  });
+});